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How the Ditec DAB305 works
The swing door operator Ditec DAB305 uses a DC motor which is connected to the output shaft
by a combination of a worm gear and spur gears. The push- or pull arm system that is connected
to the output shaft opens the door in a surface mounted application.
There is an adjustable spring mechanism, consisting of a helical compression spring combined
with a linkage system including a pressure roller that acts on a cam curve that is attached to the
output shaft. During opening of the door, the compression spring is tensioned by the rotation of
the output shaft. During the closing cycle, the accumulated spring force is transferred to the output
shaft by means of the cam curve and the pressure roller. The transferred spring force is acting in
the closing direction.
The spring force can be adjusted so that there is appropriate force to close the door when it is
manually operated or if there is a power failure.
It is possible to increase the closing force by using the motor in combination with the spring and
thereby increase the door closing force (powered close).
The mechanism consist of:
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1
Motor
2
Worm gear
3
Two spur gears
4
Output shaft
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Helical compression spring
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Spring mechanism that transfer the spring force to the output shaft
7
Cam to optimise the torque on the output shaft
8
Mechanical door stop on the output shaft (adjustable)
9
Shaft for a mechanical coordinator
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Encoder
11
Micro switch
1020527-DIen-3.0
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Issue 2021-06-07
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5 How the Ditec DAB305 works
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